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only find segs chain for missing methods when no available candidates
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bvanjoi committed May 14, 2024
1 parent 3458211 commit ade33b0
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Showing 3 changed files with 67 additions and 6 deletions.
39 changes: 33 additions & 6 deletions compiler/rustc_hir_typeck/src/method/suggest.rs
Original file line number Diff line number Diff line change
Expand Up @@ -1143,7 +1143,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
}
}

let label_span_not_found = |err: &mut Diag<'_>| {
let mut find_candidate_for_method = false;

let mut label_span_not_found = |err: &mut Diag<'_>| {
if unsatisfied_predicates.is_empty() {
err.span_label(span, format!("{item_kind} not found in `{ty_str}`"));
let is_string_or_ref_str = match rcvr_ty.kind() {
Expand Down Expand Up @@ -1219,6 +1221,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
err.note(format!(
"the {item_kind} was found for\n{type_candidates}{additional_types}"
));
find_candidate_for_method = mode == Mode::MethodCall;
}
}
} else {
Expand Down Expand Up @@ -1371,9 +1374,32 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
);
}
}
// If an appropriate error source is not found, check method chain for possible candiates
if unsatisfied_predicates.is_empty()
&& let Mode::MethodCall = mode

if !find_candidate_for_method {
self.lookup_segments_chain_for_no_match_method(
&mut err,
item_name,
item_kind,
source,
no_match_data,
);
}

self.note_derefed_ty_has_method(&mut err, source, rcvr_ty, item_name, expected);
Some(err)
}

/// If an appropriate error source is not found, check method chain for possible candidates
fn lookup_segments_chain_for_no_match_method(
&self,
err: &mut Diag<'_>,
item_name: Ident,
item_kind: &str,
source: SelfSource<'tcx>,
no_match_data: &NoMatchData<'tcx>,
) {
if no_match_data.unsatisfied_predicates.is_empty()
&& let Mode::MethodCall = no_match_data.mode
&& let SelfSource::MethodCall(mut source_expr) = source
{
let mut stack_methods = vec![];
Expand All @@ -1394,6 +1420,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
.unwrap_or(Ty::new_misc_error(self.tcx)),
);

// FIXME: `probe_for_name_many` searches for methods in inherent implementations,
// so it may return a candidate that doesn't belong to this `revr_ty`. We need to
// check whether the instantiated type matches the received one.
for _matched_method in self.probe_for_name_many(
Mode::MethodCall,
item_name,
Expand All @@ -1416,8 +1445,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
);
}
}
self.note_derefed_ty_has_method(&mut err, source, rcvr_ty, item_name, expected);
Some(err)
}

fn find_likely_intended_associated_item(
Expand Down
19 changes: 19 additions & 0 deletions tests/ui/const-generics/lookup-method.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
// https://github.com/rust-lang/rust/issues/124946

struct Builder<const A: bool, const B: bool>;

impl<const A: bool> Builder<A, false> {
fn cast(self) -> Builder<A, true> {
Builder
}
}

impl Builder<true, true> {
fn build(self) {}
}

fn main() {
let b = Builder::<false, false>;
b.cast().build();
//~^ ERROR: no method named `build` found for struct `Builder<false, true>` in the current scope
}
15 changes: 15 additions & 0 deletions tests/ui/const-generics/lookup-method.stderr
Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
error[E0599]: no method named `build` found for struct `Builder<false, true>` in the current scope
--> $DIR/lookup-method.rs:17:14
|
LL | struct Builder<const A: bool, const B: bool>;
| -------------------------------------------- method `build` not found for this struct
...
LL | b.cast().build();
| ^^^^^ method not found in `Builder<false, true>`
|
= note: the method was found for
- `Builder<true, true>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0599`.

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